2.3.3 Extension Connection2-12 InstallationExtension jacks 1 through 4 are for all kinds of telephones.Extension jacks 5 through 8 are only for digital proprietarytelephones. To make extension jacks 5 through 8 usable for allkinds of telephones, a 4-SLT Extension Expansion Card (KX-TD30870) must be installed.Telephone Wiring The maximum length of the extension line cord (twisted cable)which connects the system and the extension is as follows:Diameter of the line Max. lengthStandard Telephone 22AWG 1798m (5900 feet)24AWG 1128m (3700 feet)26AWG 698m (2290 feet)Proprietary Telephone 22AWG 360m (1180 feet)24AWG 229m (750 feet)26AWG 140m (460 feet)2 or 4-conductor wiring is required for each extension as listedbelow. There are four pins for possible connection: “T”, “R”, “D1”and “D2”.T: Tip D1: LowR: Ring D2: HighNote • If a KX-TD30870 is installedNote the jack numbers for the facsimile and standard telephone whichhave Caller ID service.• If a telephone or answering machine with an A-A1 relay is connected tothe system, set theA-A1 relay switch of the telephone or answering machine to the OFFposition.1 pair wire (T, R)1 pair wire (D 1, D2) or2 pair wire (D 1, D2, T, R) for eXtra Device Port2 pair wire (D 1, D2, T, R)WiringTelephoneStandard telephonesDigital proprietary telephone(e.g., KX-T7436, KX-T7235)Analog proprietary telephone(e.g., KX-T7030, KX-T7130)
